title: The adductor part of the adductor magnus is innervated by both obturator and sciatic nerves.
abstract: The hip adductor group, innervated predominantly by the obturator nerve, occupies a large volume of the lower limb. However, case reports of patients with obturator nerve palsy or denervation have described no more than minimal gait disturbance. Those facts are surprising, given the architectural characteristics of the hip adductors. Our aim was to investigate which regions of the adductor magnus are innervated by the obturator nerve and by which sciatic nerve and to consider the clinical implications. Twenty-one lower limbs were examined from 21 formalin-fixed cadavers, 18 males and 3 females. The adductor magnus was dissected and was divided into four parts (AM1-AM4) based on the locations of the perforating arteries and the adductor hiatus. AM1 was supplied solely by the obturator nerve. AM2, AM3, and AM4 received innervation from both the posterior branch of the obturator nerve and the tibial nerve portion of the sciatic nerve in 2 (9.5%), 20 (95.2%), and 6 (28.6%) of the cadavers, respectively. The double innervation in more than 90% of the AM3s is especially noteworthy. Generally, AM1-AM3 corresponds to the adductor part, traditionally characterized as innervated by the obturator nerve, and AM4 corresponds to the hamstrings part, innervated by the sciatic nerve. Here, we showed that the sciatic nerve supplies not only the hamstrings part but also the adductor part. These two nerves spread more widely than has generally been believed, which could have practical implications for the assessment and treatment of motor disability.
authors.affiliation: Department of Physical Therapy, School of Health Science, Ibaraki Prefectural University, Ami-machi, Ibaraki, Japan; Department of Physical Therapy and Occupational Therapy, Graduate School of Health Sciences, Sapporo Medical University, Sapporo, Hokkai-do, Japan.
authors.forename: Megumi
authors.initials: M
authors.lastname: Takizawa
authors.forename: Daisuke
authors.initials: D
authors.lastname: Suzuki
authors.forename: Hajime
authors.initials: H
authors.lastname: Ito
authors.forename: Mineko
authors.initials: M
authors.lastname: Fujimiya
authors.forename: Eiichi
authors.initials: E
authors.lastname: Uchiyama
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D002102:Cadaver; D005260:Female; D006621:Hip Joint / Q000033:anatomy & histology; D006801:Humans; D008297:Male; D018482:Muscle, Skeletal / Q000033:anatomy & histology / Q000294:innervation*; D009776:Obturator Nerve / Q000033:anatomy & histology*; D012189:Retrospective Studies; D012584:Sciatic Nerve / Q000033:anatomy & histology*; D013848:Thigh / Q000033:anatomy & histology / Q000294:innervation*; D013979:Tibial Nerve / Q000033:anatomy & histology
keywords: adductor magnus muscle; obturator nerve; sciatic nerve